/// <summary> /// Decodes a method from an LNode. /// </summary> /// <param name="data">The LNode to decode.</param> /// <param name="state">The decoder to use.</param> /// <returns> /// A decoded method if the node can be decoded; /// otherwise, <c>null</c>. /// </returns> public static IMethod Decode(LNode data, DecoderState state) { SimpleName name; if (!FeedbackHelpers.AssertMinArgCount(data, 6, state.Log) || !state.AssertDecodeSimpleName(data.Args[0], out name)) { return(null); } else { return(new IrMethod(data, state)); } }
/// <inheritdoc/> public override IType Decode(LNode data, DecoderState state) { if (data.Calls(pointerSymbol)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } var elemType = state.DecodeType(data.Args[0]); PointerKind kind; if (AssertDecodePointerKind(data.Args[1], state, out kind)) { return(elemType.MakePointerType(kind)); } else { return(ErrorType.Instance); } } else if (data.Calls(genericParameterSymbol)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } IGenericMember parent; SimpleName name; if (state.AssertDecodeGenericMember(data.Args[0], out parent) && state.AssertDecodeSimpleName(data.Args[1], out name)) { var types = state.TypeResolver.ResolveGenericParameters(parent, name); if (AssertSingleChildType(types, data, state, "generic declaration")) { return(types[0]); } } return(ErrorType.Instance); } else if (data.Calls(CodeSymbols.Of)) { if (!FeedbackHelpers.AssertMinArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } var genericDecl = state.DecodeType(data.Args[0]); var genericArgs = data.Args.Slice(1).EagerSelect <LNode, IType>(state.DecodeType); int count = genericDecl.GenericParameters.Count; if (count != genericArgs.Count) { FeedbackHelpers.LogSyntaxError( state.Log, data, FeedbackHelpers.QuoteEven( "type ", FeedbackHelpers.Print(data.Args[0]), " is instantiated with ", genericArgs.Count.ToString(), " arguments but has only ", count.ToString(), " parameters.")); return(ErrorType.Instance); } return(genericDecl.MakeGenericType(genericArgs)); } else if (data.Calls(CodeSymbols.Dot)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log)) { return(ErrorType.Instance); } SimpleName childName; if (!state.AssertDecodeSimpleName(data.Args[1], out childName)) { return(ErrorType.Instance); } var parentType = state.DecodeType(data.Args[0]); if (parentType == ErrorType.Instance) { // Make sure that we don't log an additional error // just because the parent type was wrong. return(ErrorType.Instance); } var childTypes = state.TypeResolver.ResolveNestedTypes(parentType, childName); if (AssertSingleChildType(childTypes, data, state, "type")) { return(childTypes[0]); } else { return(ErrorType.Instance); } } else { QualifiedName fullName; if (state.AssertDecodeQualifiedName(data, out fullName)) { var types = state.TypeResolver.ResolveTypes(fullName); if (AssertSingleGlobalType(types, data, state)) { return(types[0]); } else { return(ErrorType.Instance); } } else { return(ErrorType.Instance); } } }
/// <inheritdoc/> public override ITypeMember Decode(LNode data, DecoderState state) { if (data.Calls(accessorSymbol)) { if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log) || !FeedbackHelpers.AssertIsId(data.Args[1], state.Log)) { return(null); } var property = state.DecodeProperty(data.Args[0]); if (property == null) { return(null); } else { var kindName = data.Args[1].Name.Name; var accessor = property.Accessors.FirstOrDefault( acc => accessorKindEncodings[acc.Kind] == kindName); if (accessor == null) { FeedbackHelpers.LogSyntaxError( state.Log, data.Args[1], Quotation.QuoteEvenInBold( "property ", FeedbackHelpers.Print(data.Args[0]), " does not define a ", kindName, " accessor.")); } return(accessor); } } else if (data.Calls(CodeSymbols.Dot)) { // Simple dot indicates a field. IType parentType; SimpleName name; if (!AssertDecodeTypeAndName(data, state, out parentType, out name)) { return(null); } var candidates = state.TypeMemberIndex .GetAll(parentType, name) .OfType <IField>() .ToArray(); return(CheckSingleCandidate( candidates, data.Args[0], data.Args[1], "field", state)); } else if (data.CallsMin(CodeSymbols.IndexBracks, 1)) { IType parentType; SimpleName name; if (!AssertDecodeTypeAndName(data.Args[0], state, out parentType, out name)) { return(null); } var indexTypes = data.Args .Slice(1) .EagerSelect(state.DecodeType); var candidates = state.TypeMemberIndex .GetAll(parentType, name) .OfType <IProperty>() .Where(prop => prop.IndexerParameters .Select(p => p.Type) .SequenceEqual(indexTypes)) .ToArray(); return(CheckSingleCandidate( candidates, data.Args[0].Args[0], data, "property", state)); } else if (data.Calls(CodeSymbols.Lambda)) { IType parentType; SimpleName name; if (!FeedbackHelpers.AssertArgCount(data, 2, state.Log) || !FeedbackHelpers.AssertIsCall(data.Args[0], state.Log) || !AssertDecodeTypeAndName(data.Args[0].Target, state, out parentType, out name)) { return(null); } // TODO: implement generic parameter decoding, use generic // parameters in resolution process. var paramTypes = data.Args[0].Args .EagerSelect(state.DecodeType); var retType = state.DecodeType(data.Args[1]); var candidates = state.TypeMemberIndex .GetAll(parentType, name) .OfType <IMethod>() .Where(method => method.Parameters .Select(p => p.Type) .SequenceEqual(paramTypes) && object.Equals( method.ReturnParameter.Type, retType)) .ToArray(); return(CheckSingleCandidate( candidates, data.Args[0].Target.Args[0], data, "method", state)); } else if (data.Calls(CodeSymbols.Of)) { if (!FeedbackHelpers.AssertMinArgCount(data, 1, state.Log)) { return(null); } var func = state.DecodeMethod(data.Args[0]); var args = data.Args.Slice(1).EagerSelect(state.DecodeType); if (func.GenericParameters.Count == args.Count) { return(func.MakeGenericMethod(args)); } else { state.Log.LogSyntaxError( data, Quotation.QuoteEvenInBold( "generic arity mismatch; expected ", func.GenericParameters.Count.ToString(), " parameters but got ", args.Count.ToString(), ".")); return(null); } } else { state.Log.LogSyntaxError( data, Quotation.QuoteEvenInBold( "cannot interpret ", FeedbackHelpers.Print(data), " as a type member; expected a call to one of ", accessorSymbol.Name, ", ", CodeSymbols.Dot.Name, ", ", CodeSymbols.IndexBracks.Name, ", ", CodeSymbols.Of.Name, " or ", CodeSymbols.Lambda.Name)); return(null); } }